Federal Judge Blocks Arizona From Enforcing Gambling Laws on Prediction Markets

A federal judge has stopped Arizona from applying its gambling laws to prediction markets, handing a win to the Commodity Futures Trading Commission (CFTC) and the Department of Justice.

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On May 5, 2026, the District Court for Arizona issued a preliminary injunction that bars the state from pursuing criminal or civil actions against event contracts traded on CFTC‑regulated designated contract markets.

The ruling came after Arizona tried to prosecute KalshiEX LLC, a prediction market platform, for operating without a state license. The court sided with federal regulators, saying Congress gave the CFTC exclusive authority over swaps and event contracts.

How the case began and why it matters

The dispute started when Arizona’s Department of Gaming sent Kalshi a cease‑and‑desist letter, warning it to stop gambling operations in the state. Days later, the attorney general filed criminal charges, the first such prosecution against a prediction market platform. 

Kalshi responded by suing, arguing that the Commodity Exchange Act gives the CFTC sole jurisdiction over contracts traded on registered markets. The CFTC and DOJ then filed their own case against Arizona, claiming state enforcement was preempted by federal law.

The court agreed, noting that allowing states to prosecute operators would create the “inconsistent regulatory patchwork that Congress intended to avoid.” 

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The judge explained that the case reflected “a clash between two competing authorities,” state police power over gambling and Congress’s regulation of derivatives. The court ruled that event contracts qualify as swaps under the Commodity Exchange Act, rejecting Arizona’s argument that only the sporting event itself counts.

It found three separate grounds for preemption: field preemption, because the CFTC has exclusive jurisdiction; conflict preemption, because state enforcement would obstruct Congress’s goals; and impossibility preemption, since CFTC rules require open access to markets while Arizona law criminalizes wagering without a state license.

What this ruling means for the prediction market/state ruling

The Arizona ruling is part of a larger fight. Courts in other states have split on similar cases, with the Third Circuit already siding with Kalshi in New Jersey and the Ninth Circuit expected to rule soon in another challenge.

The CFTC, under Chairman Selig, has filed lawsuits against multiple states, including Connecticut, Illinois, New York, and Wisconsin to defend its authority. Selig recently warned that pushing prediction markets offshore could expose U.S. information streams to manipulation by foreign adversaries.

With appeals likely, the Arizona decision adds momentum to the federal government’s effort to cement its control over prediction markets nationwide.

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Source: Katten Muchin Rosenman LLP